Northstar 3 Unit 3

How can countries cooperate to solve the problem of space junk?

• They can work together to clean it up.

• They can argue about what to do.

• They can cancel their space programs

What body part gets weaker in lower gravity?

• brain

• bones

• lungs

Match each word to its opposite (antonym)

• stimulation

• count on

• doubt

• spin

• perish

• boredom

• remain still

• survive

• real

• artificial

Choose the best synonym for the underlined word.

The cloud of debris that surrounds the earth is often called space junk.

• trash

• water

• gas

• air

Choose the best synonym for the underlined word.

There was a big explosion when the two rockets collided.

• fell

• hit

• disappeared

• melted

Choose the best synonym for the underlined word.

Countries need to cooperate to find a solution to the problem of space junk.

• spend money

• do research

• work together

• argue

In one or more complete sentences, answer the following question.

Why should we explore space and what are the benefits?